feat(ui): ralpi-style chat progress and pipeline-overview footer

phases.ts becomes a live chat widget (spinner + tool-call tree) and the
check-runner posts per-agent tool-call summaries and an expandable
completion tree through a custom message renderer; footer.ts adds the
static pipeline-overview status strip for single checks and /pygienium-all.

README.md

@@ -147,6 +147,15 @@ registerCheck(def)            ← checks/*.ts self-register on load
   module-level `Map` of `CheckDefinition`s. `index.ts` iterates it and binds
   one `/pygienium-<name>` command per entry, so adding a check is a file +
   one `registerCheck()` line.
+- **The footer** (`src/footer.ts`) is the piolium-style pipeline-overview
+  status strip: a single static line in the TUI footer (via
+  `ui.setStatus(key, text)`) listing the full ordered pipeline with the cursor
+  on the current phase and what's to come. For a single check the items are
+  the phases; for `/pygienium-all` they're the checks (the full todo list),
+  and the per-check footer is suppressed so two overviews never compete over
+  the same status slot. The chat widget (`phases.ts`) remains the animated
+  detail view (spinner + tool-call tree + completion tree); the footer is the
+  overview — the two never overlap. In print/JSON mode the footer is a no-op.
 
 ## Layout
 
@@ -162,12 +171,13 @@ pygienium/
 │  ├─ run-state.ts         ← persistent, resumable run-state model
 │  ├─ status.ts            ← /pygienium-status formatter (pure)
 │  ├─ export.ts            ← /pygienium-export gatherer + md/json renderer
-│  ├─ phases.ts            ← footer status-strip UI adapter
+│  ├─ phases.ts            ← live chat progress widget + completion-tree helpers
+│  ├─ footer.ts            ← pipeline-overview status strip (TUI footer)
 │  ├─ modes/check-runner.ts ← the per-check phase pipeline
 │  └─ checks/              ← one file per check, self-registering
 │     ├─ registry.ts       ← CheckDefinition + registerCheck
 │     ├─ comments.ts  deep-modules.ts  dead-code.ts
-│     ├─ defensive-guards.ts  noop.ts
+│     ├─ defensive-guards.ts
 └─ agents/                 ← scanner.md  fixer.md  deep-modules.md  defensive-guards.md
 ```